docs: def findattr(self, name):
          """Search the vgroup for a given attribute.
  
          Args::
  
            name    attribute name
  
          Returns::
  
            if found, VGAttr instance describing the attribute
            None otherwise
  
           C library equivalent : Vfindattr
                                                    """
  
          try:
              att = self.attr(name)
              if att._index is None:
                  att = None
          except HDF4Error:
              att = None
          return att